The Application of Overdispersion and Generalized Estimating Equations in Repeated Categorical Data Related to The Sexual Behaviours Traits of Farm Animals
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Tarih
2007
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Journal of Applied Sciences
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this study, the poison regression, negative binomial regression and generalized estimating equations were applied to the repeated measurements based on count data obtained from the sexual behaviours of ram lambs. Negative binomial regression was more effective to handle the overdispersion that causes bias in parameter estimations in Poison regression. The generalized estimating equations were used for analyzing repeated categorical data. GEE estimates were obtained by using the exchangeable working correlation. As a result of GEE analyses, it was concluded that flehmen lip curl response, tail raising, mount duration, vocalization and weight of the ram lamb were statistically important (p<0.05) for mount frequent. However, the anogenital sniff found be not significant.
Açıklama
Anahtar Kelimeler
overdispersion, pois0n regression, negative binominal regression, generalized estimating equations
